The new created site is not published by default, that is, it is available for editing from the mssg.me personal account, but is hidden for visiting.
To make the site open to visitors when they click on the link that lead to it:
Open the “My Websites” section in your mssg.me personal account, you can go to this section by clicking here
Click on one of the created sites
In the upper right corner of the page, near to the link that lead to the created site, click on “Publish”
If necessary, the site can be hidden for visiting, for this:
Open the “My Websites” section in your mssg.me personal account, you can go to this section by clicking here
Click on one of the created sites
Open the “Settings” section
Click on the “Published” button
Click on “Not published”
Click on the “Apply” button